From the Clannad wikipedia page:The license holding company Sentai Filmworks licensed the Clannad anime series,[91] and ADV Films localized and distributed the television series and the OVA starting with the first half season box set consisting of 12 episodes with English subtitles, Japanese audio, and no English language track, which was released on March 3, 2009.[92] The second half season box set containing the remaining episodes was released on May 5, 2009.[93] Sentai Filmworks licensed the Clannad After Story anime series;[94] Section23 Films localized and distributed both the television series and OVA starting with the first half season box set with English subtitles released on October 20, 2009. The second half box set was released on December 8, 2009. Sentai Filmworks re-released Clannad in a complete collection set on June 15, 2010, which featured an English dub, produced at Seraphim Digital.[95][96] The English dub premiered on March 25, 2010 on the Anime Network.[97] Sentai Filmworks re-released Clannad After Story with an English dub on April 19, 2011,[98] and re-released Clannad on BD in November 2011.[99]